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2.
The 50 is a common name given to the police..it's also a name of a talentless rapper!
"Oh sh*t the 50 are behind us"
by Dean Paul October 22, 2006
 
1.
the police
shit, its the 5 0
by God#28 April 08, 2004
 
3.
"Police"

A term deriving from when Police cruisers had a 5.0 liter engine.
"Run nigga here comes the 5-0!"
by Brandon Fandel October 08, 2007
 
4.
undercover police
fire it up, but watch out for 5 0
by brent April 10, 2004